A PHP class for making interactions with the D&H Supply API: https://www.dandh.com/
This API class can send an order and its products to D&H for fulfillment and check on the status of fulfillment for an order.
Construct the Object
$dandh_usercode = "xxxxxxxxx";
$dandh_password = "xxxxxxxxx";
$dropship_password = "xxxxxxxxx"; // dropship password is optional but required if doing drop shipping
$dandh_api = new dandh_api($dandh_usercode, $dandh_password, $dropship_password);